This isn't a book for weekend tourists. This is for those who want in-depth knowledge of the language, say foreigners who want their business correspondence to be written in flawless Danish, or higher-level second language students aiming for excellent scores. There are no quick-quizzes or teach-yourself exercises. It is a comprehensive collection of rules (and exceptions to these) that serve as the foundation for the language.
A lot of Danish language books tend to avoid discussing grammar altogether, and focus instead on skills like social conversation, pronunciation, or vocabulary for daily living. That's a great approach too, but at some point, serious students will look for a firm scaffold on which to build new knowledge. This is an excellent reference for such students.